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Three weeks after the earthquake and tsunami that crippled Japan's Fukushima Daiichi nuclear power plant workers have made some headway in cooling the facility's overheated fuel rods. But overall, the situation remains "very serious," according to the International Atomic Energy Agency (IAEA) . Despite the ongoing work to stabilize the plant and fears that radioactive materials had contaminated tap water as far away as Tokyo, 240 kilometers to the south, most of the recommended restrictions on drinking water have been lifted.

At 2:46 pm local time March 11, an 8.9-magnitude earthquake struck Sendai, a port city of one million residents in northeastern Japan. It was the largest earthquake recorded in Japan in the last century.